Process of manufacturing pattern-plates.



PATENTED MAR. 6, 1906.

I. BONVILLAIN. PROCESS OF MANUFACTURING PATTERN PLATES.

APPLICATION FILED JULY29,1904.

v ZWWL f MW UNITED STATES. PATENT OFFICE.-

Specification of Letters Patent.

Patented March 6, 1906.

Application filed July 29, 1904. Serial No. 218,626.

To all whom it may concern:

Be it known that I, PHILIBERT BoNvIL- LAIN, a citizen of the Republic of France, and a resident of Paris, France, have invented a certain new and useful Improved Process of Manufacturing Pattern-Plates, of which the following is a specification.

This invention relates to a process for the rapid manufacture of small metallic patternplates, as used in multiple molding of small castings in foundries but instead of making a duplex pattern-plate containing on one side the top of the multiple patterns and on the other side the bottom parts of same multiple patterns, in which top and bottom of each pattern must correspond, the new apparatus are so combined that they allow the making of small metallic pattern-plates with symmetrical patterns'i. e.,having the tops and bottoms of the pattern of one casting or multiple patterns of the same or different casting symmetrically disposed side by side. When ready, three, four, or five of these small metallic pattern-plates, according to size, are inserted in a special frame or pattern-plates table, which form thus assembled constitutes a complete multiple pattern-plate, ready for use, and this multiple pattern has the enormous advantage of being variable at will- 21. a, when the number of copies of one patternplate is over the pattern-plate is taken off from the pattern-plate table and replaced instantaneously by another one, so that the molder never makes more molds than required of each pattern, which is not possible with the present solid multiple-pattern-plate system. It is possible to mold at one time a series of pattern-plates conveniently assembled or juxtaposed; butit may occur that one of these may be required to be molded a less number of times than the others. One may then be withdrawn to obtain a sufficient number of moldings from it, and it may be replaced by another, whereas if the said pattern-plate was made solid with the others this would be impossible, since there would then necessarily result the same number of moldings from each pattern-plate.

In order that the invention may be more clearly understood, apparatus according thereto is illustrated, by Way of example, in the accompanying drawings, in which Figures 1 to 3 are sectional elevations in the direction of line 3 3 of Fig. 4 of the moldboxes employed for casting a molding-plate arranged in accordance with the successive stages of the operation. Fig. 1 is a perspec tive View of part of two superposedframes. Fig. 4 is a plan view of the apparatus shown 'in Fig. 2. Fig. 5 is a plan of a frame adapted to be inserted between the mold-boxes. F 1g. 6 is a sectional elevation of the cast moldingplate in its position on the molding-table, and Fig. 7 a sectional elevation of two molds obtained by means of the molding-plate in their connected position ready for casting.

These apparatus comprise First. Two special frames A and B, closed on their four sides, which when superposed form a complete molding-box, as shown in Fig. 1. Side projections or flanges are provided to assemble them accurately together, either superposed, as in Fig. 1, or placed side by side, as in Figs. 2, 3, and 4. It must be noticed that the two sides marked 1) b in both frames are of a particular shape, as shown in Fig. 1*, and are provided with grooves to form when assembled together side by side a semicircular groove h, which forms the central line as of the molding-plate. (See Figs. 2 and 3.) Besides in the edges Z Z semicircular openings are cut at two or three points, as shown in Fig. 1 in order to allow connections between the central and lateral runners, but not sufliciently large to allow sand to escape when rammed by hand to form a mold.

Second. A special frame d, with deep side flanges e, accurately machined, so as to slide smoothly, but Without any lateral play, on the frames A and B, assembled together side by side, as shown in Figs. 2 and 3. This frame d has a central partitionf of a special shape, having a groove 9 provided to obtain on the back of the pattern-plate a rib g", which insures the perfect accuracy of its axis 5 of symmetry when inserted in the patternplates table.

Third. A special frame 7c, well machined (so as to be of a perfectly even thickness,) which is inserted between the frames A and B, assembled side by side, and the frame (1 and servesto insure a regular even thickness in all the pattern-plates, which are then perfectly interchangeable. The frame 7c has its two internal longitudinal sides grooved, and on these grooves m m slides a rule a, which serves to limit the length of pattern-plates according to size of patterns or number of patterns included in each of them.

Fourth. Two cast-iron block-weights Z Z,

well planed on their smaller flat surfaces, to load the whole apparatus when casting pattern-plates.

Fifth. A pattern-table 0, Which forms a multiple pattern-plate of which the parts are variable at will, pattern-plates being very easily inserted in it or taken out to be replaced by other pattern-plates when necessary in order to make only the strict number of copies required of each pattern.

How to make the small metal moldingplates or pattern-plates with symmetrical patterns: To make a pattern-plate, a first copy of the pattern a is made in the ordinary Way by means of frames A and B. (See Fig. 1.) The top part B being lifted perfectly truly and level from the part A is placed side by side to it, andpattern a is taken off from the part A. Part A has the impression of the "bottom and inside portion of pattern a, and B has the impression of the top or outsideportion of same. This being done, the frame d is put on the top of frames A and B, assembled together, as shown in Fig. 2, and a layer of sand is rammed in it to give the exact counterpart of both above impressions. Frame (1 being removed by lifting it with great care, it is necessary to cut or take off rom it part of the sand on all the vertical and inclined walls and to provide ribs wherever necessary to insure suflicient resistance to the pattern-plate to resist the pressure exerted on it when molding. This being done, the frame 7c is put into position, as shown" in Figs. 3 and 4, and on the top of it is placed the frame (1 in exactly the same position as before, after having limited the length of the pattern-plate by placing a flat rule n at the right point, according to size of the pattern a. The sectional view in Fig. 3 shows clearly the free space left for the metal that will form the pattern-plate, cylindrical and annular openings, as shown at i and j, being provided to form parts to support the center parts of the pattern-plate in the operation of molding and preventit from bending under pressure. Cast-iron blocks 1 Z having been put on the top of the frame (1, planed faces downward and arranged to cover exactly the openings 01 and j, the metal is poured into the mold thus formed. The pattern-plate thus obtained has therefore on its upper face two distinct impressions, one corresponding to the internal or top shape of the pattern a, while By 111- metrically disposed side by side is the internal or bottom shape of same pattern a, the small pattern-plate thus constituted having on its medial line a half-round projection to form the runner in the mold with runners from the central part to the patterns and lateral ribs for fixing on the pattern-plate table.

On the opposite face the pattern-plate has a shaped rib g formed by the groove g, which is to engage in a groove of similar shape on the pattern-plate table 0, which determines the exact position of the pattern-plate. The pattern-plate thus made is ready to be inserted in the pattern-plate table 0. To do this, the rib formed by the groove 9 and cylindrical and annular projections formed by the openings 4. and are placed downward, the rib g fitting exactly in the groove g on the central partition of the pattern-plate table 0. (See Fig. 6.) Lugs s, placed opposite lugs t of the patternplate table 0, bear eccentric bolts 11., which being revolved press bars 1 against the table and the edges of the pattern-plate, thus fixing it firmly. This being done, if we take two successive impressions of the pattern-plate thus obtained and if We put the second impression on the first one, left-hand side over righthand side, we have two complete molds of pattern a. (See Fig. 7.) In this double mold the impressions left by the semicircular projections at in each of them are superposed on each other perfectly accurately, forming a cylindrical channel through which metal is poured into the mold. (See Fig. 7.)

The apparatus shown is not claimed herein, the same being made the subject of a divisional application.

Having now particularly described and ascertained the nature of my said invention and in What manner the same is to be performed, I declare that what I claim is A process of making pattern-plates with symmetrical impressions for use in foundries consisting in making a mold of the object in two superposed frame parts or flasks, in placing said flasks side by side upon two faces adjusted so that the upper and lower impressions of the mold shall be disposed symmetrically with the line of junction of the flasks, in taking a molding of the symmetrical impressions in a flask superposed upon the firstmentioned flasks, and finally in interposing between the upper and under flasks a frame of thickness corresponding to that of the plate to be obtained in order to insure the space between the impressions necessary for pouring the fused metal and pouring molten metal into said space, substantially as de scribed and for the purpose specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

PHILIBERT BONVILLAIN.

Witnesses:

HANSON O. Goxn, PAUL BAGARD. 

